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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2cfd80ee7e2728befb8e628089069b9c77c6d044b57f69176b4203c53a6231' 
  AND token = 'KO2BRiHlkRIc9x/8Q5KRB79F4SKowqJshlkoEzGNSZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}